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Share-based Payments - Summary of Outstanding and Exercisable Options (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) shares yr | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of options | shares | 12,902,995 | 11,603,750 | 6,177,594
Weighted average,Exercise price | $ | $ 2.99 | $ 2.05 | $ 1.10
Weighted average,Remaining contractual life (years) | yr | 3.35 |  |
Number of options, Vesting of issued options | shares | 5,648,656 |  |
Weighted average exercise price, Vesting of issued options | $ | $ 2.28 | $ 1.71 |
Weighted average remaining contractual life (years), Exercisable | yr | 3.14 |  |
August 5, 2016 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | August 5, 2021 |  |
Number of options | shares | 1,058,334 |  |
Weighted average,Exercise price | $ | $ 0.50 |  |
Weighted average,Remaining contractual life (years) | yr | 2.60 |  |
October 6, 2016 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | October 6, 2021 |  |
Number of options | shares | 3,411,699 |  |
Weighted average,Exercise price | $ | $ 1.23 |  |
Weighted average,Remaining contractual life (years) | yr | 2.77 |  |
November 21, 2016 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | November 21, 2021 |  |
Number of options | shares | 182,000 |  |
Weighted average,Exercise price | $ | $ 1.84 |  |
Weighted average,Remaining contractual life (years) | yr | 2.89 |  |
April 12, 2017 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | April 12, 2022 |  |
Number of options | shares | 3,273,020 |  |
Weighted average,Exercise price | $ | $ 3.14 |  |
Weighted average,Remaining contractual life (years) | yr | 3.28 |  |
August 23, 2017 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | August 23, 2022 |  |
Number of options | shares | 2,872,941 |  |
Weighted average,Exercise price | $ | $ 2.42 |  |
Weighted average,Remaining contractual life (years) | yr | 3.65 |  |
November 9, 2017 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | November 9, 2022 |  |
Number of options | shares | 200,000 |  |
Weighted average,Exercise price | $ | $ 3.32 |  |
Weighted average,Remaining contractual life (years) | yr | 3.86 |  |
January 30, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | January 30, 2023 |  |
Number of options | shares | 275,001 |  |
Weighted average,Exercise price | $ | $ 8.40 |  |
Weighted average,Remaining contractual life (years) | yr | 4.08 |  |
January 31, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | January 31, 2023 |  |
Number of options | shares | 150,000 |  |
Weighted average,Exercise price | $ | $ 9.00 |  |
Weighted average,Remaining contractual life (years) | yr | 4.09 |  |
May 18, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | May 18, 2023 |  |
Number of options | shares | 1,195,000 |  |
Weighted average,Exercise price | $ | $ 7.57 |  |
Weighted average,Remaining contractual life (years) | yr | 4.38 |  |
June 28, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 60 months |  |
Expiry date | June 28, 2023 |  |
Number of options | shares | 180,000 |  |
Weighted average,Exercise price | $ | $ 8.22 |  |
Weighted average,Remaining contractual life (years) | yr | 4.49 |  |
September 13, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | September 13, 2025 |  |
Number of options | shares | 25,000 |  |
Weighted average,Exercise price | $ | $ 14.70 |  |
Weighted average,Remaining contractual life (years) | yr | 6.71 |  |
October 12, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 48 months |  |
Expiry date | October 12, 2025 |  |
Number of options | shares | 30,000 |  |
Weighted average,Exercise price | $ | $ 11.80 |  |
Weighted average,Remaining contractual life (years) | yr | 6.79 |  |
December 14, 2018 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vested terms of options | Evenly over 20 quarters |  |
Expiry date | December 14, 2025 |  |
Number of options | shares | 50,000 |  |
Weighted average,Exercise price | $ | $ 15.29 |  |
Weighted average,Remaining contractual life (years) | yr | 6.96 |  |

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